WO2010144889A1 - Procédés et appareil pour un modèle de plugiciel pour publier une découverte à base de métadonnées structurées - Google Patents

Procédés et appareil pour un modèle de plugiciel pour publier une découverte à base de métadonnées structurées Download PDF

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Publication number
WO2010144889A1
WO2010144889A1 PCT/US2010/038440 US2010038440W WO2010144889A1 WO 2010144889 A1 WO2010144889 A1 WO 2010144889A1 US 2010038440 W US2010038440 W US 2010038440W WO 2010144889 A1 WO2010144889 A1 WO 2010144889A1
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WIPO (PCT)
Prior art keywords
service
native
keyword
service description
information
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PCT/US2010/038440
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English (en)
Inventor
Ashwin Swaminathan
Ranjith S. Jayaram
Vidya Narayanan
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Qualcomm Incorporated
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Application filed by Qualcomm Incorporated filed Critical Qualcomm Incorporated
Priority to KR1020127000768A priority Critical patent/KR101357704B1/ko
Priority to CN201080025464.8A priority patent/CN102461125B/zh
Priority to JP2012515206A priority patent/JP2012530299A/ja
Priority to EP10728969A priority patent/EP2441234A1/fr
Publication of WO2010144889A1 publication Critical patent/WO2010144889A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/51—Discovery or management thereof, e.g. service location protocol [SLP] or web services
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S707/00—Data processing: database and file management or data structures
    • Y10S707/99931—Database or file accessing
    • Y10S707/99933—Query processing, i.e. searching
    • Y10S707/99936—Pattern matching access

Definitions

  • the present disclosure relates to a mobile operating environment, and more particularly, to overlay networks and methods and apparatus for publishing data structures therein.
  • An overlay network is a virtual network of nodes and logical links that is built on top of an existing network. Examples of an overlay network include, but are not limited to, the Internet, Chord, Content Addressable Network (CAN), Pastry, and Viceroy.
  • each node can store a portion of overlay network data, called a partition, so as to distribute the data across the network to increase network efficiency in storage and retrieval of the data.
  • a device or node that joins an overlay network may desire to obtain a service from another device or node in the overlay network.
  • Such services are published in the overlay network using any one of a plurality of service description languages, each having a corresponding service discovery protocol for use to find the published service.
  • service discovery is the action of finding a service provider for a requested service. When the location of the demanded service (typically the address of the service provider) is retrieved, the user may further access and use it.
  • service discovery protocols include two entities: (a) the service provider - who provides the service on the overlay, and (b) the client - who uses the service.
  • examples of a service provider include nodes which provide services such as printing, scanning, faxing, storage, music share, file share, games, and web services such as for booking movie tickets, hotels, air tickets, or online gaming, etc.
  • any node in the network can act as a client.
  • the goal of service discovery is to help the client find a service provider for a particular service of interest (if such a service exists).
  • the service provider For service discovery to be successful in a peer-to-peer overlay network, the service provider should specify its service(s) using a service description language, metadata about the service should be stored in some searchable form on nodes in the overlay, and clients should be able to express the service requests using searchable keywords that are passed on to the querying system to help find the corresponding services.
  • a method of publishing or discovering services in a network comprises receiving a native service description of a service in a first service description language for publication in a network; extracting one or more keywords from the native service description, wherein each keyword corresponds to information required for service discovery on the network; extracting one or more additional information from the native service description corresponding to each of the one or more extracted keywords; generating a searchable service description according to a normalized schema having a required field and a publish with keyword field, wherein the required field comprises each keyword extracted from the native service description, wherein the publish with keyword field comprises the extracted additional information corresponding to each extracted keyword; and publishing the overlay searchable service description to the network to advertise the service.
  • Yet another aspect relates to an apparatus comprising means for receiving a native service description of a service in a first service description language for publication in a network; means for extracting one or more keywords from the native service description, wherein each keyword corresponds to information required for service discovery on the network; means for extracting one or more additional information from the native service description corresponding to each of the one or more extracted keywords; means for generating a searchable service description according to a normalized schema having a required field and a publish with keyword field, wherein the required field comprises each keyword extracted from the native service description, wherein the publish with keyword field comprises the extracted additional information corresponding to each extracted keyword; and means for publishing the searchable service description to the network to advertise the service [0015] Another aspect relates to an apparatus for publishing services in a network comprising a receiver configured to receive a native service description of a service in a first service description language for publication in a network; a searchable schema plug-in component configured to extract one or more keywords from the native service description, wherein each keyword corresponds to information
  • a method for processing a network search query comprises receiving a native service query in a native service description language; translating the native service query into a searchable query according to the normalized schema; search a network for services identified by the native search query, the search being performed according to the normalized schema; and translate search results from the normalized schema to the native search description language.
  • the one or more aspects comprise the features hereinafter fully described and particularly pointed out in the claims.
  • the following description and the annexed drawings set forth in detail certain illustrative features of the one or more aspects. These features are indicative, however, of but a few of the various ways in which the principles of various aspects may be employed, and this description is intended to include all such aspects and their equivalents.
  • FIG. 1 is a block diagram of an aspect of a peer-to-peer network
  • FIG. 2 is a schematic diagram of an aspect of a system for service publication, which supports the various different service description languages, in a network;
  • Fig. 3 is a schematic diagram of an aspect of a computing device configured to perform the functionality described herein in the network of Fig. 1 or the system of Fig.
  • FIG. 4 is a flowchart of an aspect of a method of generating and publishing a searchable service description
  • FIG. 5 is a flowchart of an aspect of a method of processing a query for services
  • FIG. 6 is a schematic diagram of an aspect of a system for publishing and discovering services in a network
  • Fig. 7 is an example of a normalized schema
  • Fig. 8 is another example of a normalized schema.
  • Networks such as peer-to-peer networks rely on the ability to discover devices and services offered by those devices on a computer network.
  • Various service description language schemas may be used to describe a service.
  • the systems and methods described herein provide a common framework for publishing and discovering services. Services may be published and discovered irrespective of the service description language used to describe the service.
  • the network 100 comprises an underlying network 102 that comprises any type of network, such as an Internet Protocol network.
  • the underlying network 102 is shown as a single entity, the underlying network may comprise any number or types of networks such as WANs, LANs, wireless networks, or any other type of network.
  • Fig. 1 depicts a peer-to-peer overlay network, the present application is not limited to overlay networks.
  • the systems and methods described herein are equally applicable to any type of network, including a centralized network.
  • the network 100 may include a server that provides discovery services.
  • the server may act as a directory that hosts information relevant for discovery.
  • the server may host keywords and corresponding information that are published by the nodes in the network.
  • the nodes may publish the information to the server, and queries may also be sent to the server.
  • the underlying network 102 comprises multiple peer-to-peer networks (104, 106, and 108).
  • the peer-to-peer networks 104, 106, and 108 each comprise a subset of nodes of the underlying network 102, and operate utilizing the services of the underlying network 102 to allow those nodes to communicate.
  • the nodes are connected by communication links provided by the underlying network 102 to form desired routing paths.
  • the peer-to-peer networks 104, 106, and 106 may have any topology or architecture to enable any routing configuration, and are not limited to the configurations shown in Fig. 1.
  • each node can operate as a service provider and/or as a client. That is, the node may provide services to the overlay, and may use services of one or more other nodes.
  • Such services may include, for example, printing, scanning, faxing, storage, music share, file share, games, and web services such as booking movie tickets, hotels, air tickets, or online gaming. It is noted, however, that these examples of services are non-limiting, and the actual services may include more or less services than those listed.
  • Each node may comprise a computing device such as, for example, a personal computer, a laptop computer, a wireless communications device, a mobile telephone, a personal digital assistant, a printer, a fax machine, and/or any other network-connectable computing device.
  • a computing device such as, for example, a personal computer, a laptop computer, a wireless communications device, a mobile telephone, a personal digital assistant, a printer, a fax machine, and/or any other network-connectable computing device.
  • a service discovery protocol may be used to assist a node acting as a client in finding a service provider for a particular service of interest.
  • a service provider specifies its services using a service description language such as, for example, extensible Markup Language (XML), Research Description Format (RDF), RDF-S, Web Service Description Language (WSDL), WSDL-S, Ontology Web Language (OWL), Ontology Web Language for Services (OWL-S), Universal Description Discovery and Integration (UDDI), Universal Plug and Play (UPnP), and/or other service description languages.
  • Metadata about the services is stored in a searchable format on the nodes in the overlay, and clients may express a service request using searchable keywords that are passed on to a querying system to help find the corresponding services.
  • Fig. 2 depicts an exemplary system 200 for service publication, which supports the various different service description languages.
  • System 200 provides a common framework for services to advertise and be discovered on a peer-to-peer network.
  • data 202 for a service description may be published using any service description language/schema 204 such as, for example, XML, XDS, RDF, RDF-S, WSDL, UDDI, UPnP, OWL, OWL-s, etc.
  • One or more plug-in modules 206 may be provided to convert a service description from its native form, e.g. in a respective service description language 204, to a searchable service description 208 based on a normalized schema 209. The searchable service description 208 may then be published on the overlay network 210.
  • the searchable service description 208 enables aggregation of all of the information required for service discovery, and the information required to rank-order and access services. Publishing the searchable service description 208 may include extracting keywords from the native service description. Keywords may be extracted, for example, as XML attribute-value pairs, as RDF triples, as simple keywords, or according to any other extraction method.
  • the plug-in module 206 provides the normalized schema 209 that defines specific fields to be extracted and a format for extracting the fields.
  • the normalized schema 209 is not a service description language as it does not provide all of the functionalities of a service description language. Unlike the use of translators, plug-in module 206 does not translate from one service description language to one or more other service description language.
  • plug-in module 206 facilitates the extraction of certain data from the original service description based on the normalized schema 209.
  • the fields specified by the normalized schema 209 are mapped to particular data in the native service description 204. Accordingly, it is the information that is extracted according to the normalized schema 209 that is published on the overlay network.
  • a single description can be published to the network that can be searched and recognized by any node.
  • Fig. 3 depicts an exemplary computing device 300 that may serve as a node in a peer-to-peer and/or overlay network.
  • Computing device 300 includes a processor 302 for carrying out processing functions associated with one or more components and functions described herein.
  • Processor 302 can include a single or multiple set of processors or multi-core processors.
  • processor 302 can be implemented as an integrated processing system and/or a distributed processing system.
  • Computing device 300 further includes a memory 304, such as for storing local versions of applications being executed by processor 302.
  • Memory 304 can include any type of memory usable by a computer, such as random access memory (RAM), read only memory (ROM), tapes, magnetic discs, optical discs, volatile memory, non-volatile memory, and any combination thereof.
  • computer device 300 includes a communications component 306 that provides for establishing and maintaining communications with one or more parties utilizing hardware, software, and services as described herein.
  • Communications component 306 may carry communications between components on computer device 300, as well as between computer device 300 and external devices, such as devices located across a communications network and/or devices serially or locally connected to computer device 300.
  • communications component 306 may include one or more buses, and may further include transmit chain components and receive chain components associated with a transmitter and receiver, respectively, operable for interfacing with external devices.
  • communications component 306 may be configured to enable computer device 300 to communicate with other nodes in an overlay network.
  • computer device 300 may further include a data store 308, which can be any suitable combination of hardware and/or software, that provides for mass storage of information, databases, and programs employed in connection with aspects described herein.
  • data store 308 may be a data repository for applications not currently being executed by processor 302.
  • Computer device 300 may additionally include a user interface component 310 operable to receive inputs from a user of computer device 300, and further operable to generate outputs for presentation to the user.
  • User interface component 310 may include one or more input devices, including but not limited to a keyboard, a number pad, a mouse, a touch-sensitive display, a navigation key, a function key, a microphone, a voice recognition component, any other mechanism capable of receiving an input from a user, or any combination thereof.
  • user interface component 310 may include one or more output devices, including but not limited to a display, a speaker, a haptic feedback mechanism, a printer, any other mechanism capable of presenting an output to a user, or any combination thereof.
  • computer device 300 may also include one or more searchable schema plug-in modules 206.
  • the one or more plug-in modules 206 may be stored in memory 304.
  • Each schema plug-in module 206 may be configured to generate searchable service descriptions 208 (Fig. 2) from service descriptions written in any service description language 204 based on a normalized schema 209.
  • the searchable service description 208 is published to the network, and is used to process queries for service.
  • Generating the searchable service description 208 includes extracting keywords from the service description in its native form, and then advertising these keywords in the format of the searchable service description 208 on the network.
  • Computer device 300 may further include a publishing processing module 312 that facilitates publishing searchable service descriptions 208 (Fig. T).
  • a query processing module 314 may be included for processing queries to the network.
  • query processing module 314 may be configured to translate the query based on the normalized schema 209. Accordingly, the search can be performed of the network. Once search results have been obtained, query processing module 314 may be configured to translate the results back to the native service description language of the original query, and to forward the results to the requester.
  • Fig. 4 is a flowchart depicting an exemplary method of generating and publishing a searchable service description. As depicted at 402, the process begins with the receipt of a service description written in a native service description language such as, for example, XML, RDF, WSDL, OWL, and/or any other service description language. Plug-in module 206, depicted in Figs. 2 and 3, may receive the native language service description.
  • a native service description language such as, for example, XML, RDF, WSDL, OWL, and/or any other service description language.
  • Plug-in module 206 depicted in Figs. 2 and 3 may receive the native language service description.
  • Keywords may correspond to, for example, service names, service description language, etc.
  • a searchable service description is created using the extracted keywords and the other identified information, based on a normalized schema.
  • the searchable service description may comprise fields such as but not limited to, for example, required, optional, and "publish with keywords.”
  • the normalized schema comprises attributes within each field that may be selected from a plurality of attributes in a service description language file. Different service description languages may have different naming conventions for the particular attributes.
  • the normalized schema defines a standard attribute name for each attribute.
  • the required field comprises all of the information from the native service description that must be published on the network for service discovery. Examples of required information include but are not limited to, for example, the service name associated with the service description, information about the service description language used by the service, etc. The required field may include more than one service description language if the service has been described by multiple languages. In addition, other information such as a text description and/or keywords to facilitate service discovery, information to contact the service, and/or a list of possible keywords that are relevant to the service and not described by other fields may be included in the required field.
  • the optional field includes all of the information that may be published for service discovery. This field presents additional information to facilitate advanced search and discovery, and may not contain fields that are already in the required field. Examples entities within the optional field may include, for example, information about the possible types of inputs that a service takes, information abut the possible types of outputs that the service produces, preconditions of the service and ranges over a precondition instance defined according to the schema, information about a particular result of the service and under what condition the outputs are generated, information about the publisher, a list of possible keywords that are relevant to the service and not described by the other fields, and/or other information.
  • the "publish with keyword” field comprises information that needs to be published along with keywords extracted from the required and optional fields.
  • the "publish with keyword” field may include, for example, information that is specific to a particular keyword and is only stored with that chosen keyword, information about the service being described that is stored with all keywords extracted from the service description, and/or other information.
  • information specific to a particular keyword could include the number of times a particular keyword occurs in the document of service description. This information can be useful for relevance-based searching, where the ranking of query results is done based on term- frequency values.
  • the searchable service description created based on the normalized schema may be published to the network.
  • FIG. 5 is a flowchart depicting an exemplary method for processing a query for services.
  • the process begins when the query is received in a native search description language.
  • the query is then translated, based on the normalized schema, into a service query.
  • a search may be performed of the network for services matching the service query.
  • the network stores services descriptions that have been formatted based on a normalized schema.
  • results of the search query are received.
  • the results are also formatted according to the normalized schema.
  • the results are translated into the original or native service description language of the corresponding native search query.
  • system 600 for publishing and discovering services in a network.
  • system 600 includes functional blocks that can represent functions implemented by a processor, software, or combination thereof (e.g., firmware).
  • System 600 includes a logical grouping 602 of electrical components that act in conjunction.
  • System 600 may be implemented, for example, by a computing device acting as a node in a peer-to-peer network.
  • Logical grouping 602 can include a module for receiving a native service description of a service in a first service description language for publication in a network 604. Moreover, logical grouping 602 can include a module for extracting one or more keywords from the native service description, wherein each keyword corresponds to information required for service discovery on the network 606.
  • Logical grouping 602 may further include a module for extracting one or more additional information from the native service description corresponding to each of the one or more extracted keywords 608; a module for generating a searchable service description according to a normalized schema having a required field and publish with keyword field, wherein the required field comprises each keyword extracted from the native service description, wherein the publish with keyword field comprises the extracted additional information corresponding to each extracted keyword 610; and a module for publishing the searchable service description to the network to advertise the service 612.
  • system 600 can include a memory 618 that retains instructions for executing functions associated with electrical components 604 - 612. While shown as being external to memory 618, it is to be understood that electrical components 604 - 612 can exist within memory 618.
  • a normalized schema 209 is the Genie Searchable Schema, available from Qualcomm, Inc.
  • the Genie Searchable Schema is not a service description language. It does not provide all the functionalities of a service description language and must not be understood as one.
  • the GSS just provides a mechanism to aggregate all the information required for service discovery and information required to rank-order and access services.
  • a service is described using its native service description; this could be OWL-S, WSDL, UPnP, or any other known or yet-to-be- discovered schema. Publishing this information onto the overlay involves two steps. The first step is extracting the keywords from the description.
  • Each extracted keyword can be one of three types, namely, simple keywords, XML attribute-value pairs, and RDF triples.
  • the next step is to advertise these keywords on the overlay. This can be done using a PUT command.
  • the PUT command has as inputs a ResourceName, AuthName, KindID, Name, Value, and LifeTime. Note that the PUT command supports three different kindIDs, namely, KEYWORD, XML KEYWORD, and RDFJCEYWORD, for three types of keywords.
  • the GSS acts as an intermediate step in service publication. It contains a list of keywords that are extracted from the original service description along with a list of additional side information that may be published along with these keywords.
  • the GSS is an end product of step 1 and provides a node, which may include Genie middleware, with some information about what parts of the service description may be published and what may be stored in the overlay.
  • the GSS itself is not stored as one document in any node in the overlay.
  • the GSS contains three basic fields:
  • FIG. 7 depicts an example of the GSS 700.
  • the required field 702 contains all the information that needs to be published on the overlay for service discovery.
  • the required field 702 may contain the following entities as listed below.
  • the required field 702 of any GSS 700 contains servicename and servicedescriptionlanguage and the remaining fields within the required field 702 are optional to include in the GSS 700.
  • Table 1 depicts examples of entries in the required field.
  • the field servicedescriptionlanguage contains information about the service description language used by the service.
  • the required field must contain at least one servicedescriptionlanguage field.
  • the required field may contain more than one servicedescriptionlanguage field if the service has been described by multiple languages.
  • the value in this field needs to be standardized to allow nodes/applications to search for services that are described by a particular language. Possible choices include:
  • the field searchKeywords has a list of possible keywords that are relevant to the service. This information could be extracted from the native service description or could be simply added by the service, application, or node when it publishes the service.
  • the information in the searchKeywords field could be simple keywords, XML attribute- value pairs, or RDF triples. If the keyword is added by external means (via service or application etc), then it is enclosed within the field userDefinedKeyword as in Figure 7.
  • the optional field 704 contains all the information that may be published for service discovery.
  • the optional field 704 presents additional information to facilitate advanced search and discovery and may not contain the fields that are already in the required field. All the entities within the optional field are indeed optional and may contain the following entries depicted in Table 2.
  • the field servicePublisher may have additional sub-fields, namely, servicePublisherName, which contains the name of the publisher; textDescription, which contains the text description and/or keywords about the publisher (the service advertisement may add additional keywords if it would like users to search with those keywords); and contactlnformation, which contains information about ways to contact the service.
  • the field searchKeywords has a list of possible keywords that are relevant to the service and not directly covered in the required field. This information could be extracted from the native service description or could be simply added by the service, application, or node when it publishes the service.
  • the information in the searchKeywords field could be simple keywords, XML attribute-value pairs, or RDF triples. Possible examples include serviceParameter and serviceCategory fields in OWL-S schema.
  • the field serviceParameter has an expandable list of properties that may accompany the profile description in OWL-S. It may have additional sub-fields, namely, serviceParameterName (the name of the actual parameter), and sParameter (points to the value of the parameter).
  • serviceCategory describes categories of services on the basis of some classification that may be outside OWL-S and possibly outside OWL [OWL-S]. It contains the following fields: (a) categoryName: is the name of the actual category, (b) taxonomy: stores a reference to the taxonomy scheme, (c) value: points to the value in a specific taxonomy, and (d) code: stores the code associated with the taxonomy for each type of service.
  • serviceParameter and serviceCategory fields are present in the main Profile description in OWL-S version 1.1 and have been deprecated outside Profile.owl in more recent versions starting with version 1.2. In these versions, these fields can be found in separate files ServiceParameter. owl and ServiceCategory.owl, respectively.
  • the optional field and its sub-fields may or may not be published. Therefore, the required and optional fields provide a way for the overlay to decide what must and may be published in the overlay for service discovery.
  • the publish WithKeyword field 706 contains the information that needs to be published along with keywords extracted from the required and optional fields.
  • the publish WithKeyword field 706 primarily includes two types of information, namely, keywordSpecificInfo, which contains information that is specific to a particular keyword and is stored only with that chosen keyword; and serviceSpecificInfo, which contains information about the service being described.
  • keywordSpecificInfo is a property of the service and is stored with all keywords extracted from the service description.
  • An example of keywordSpecificInfo is numberOfOccurrences, which is the number of times a particular keyword occurs in the document or service description. This information can be useful for relevance-based search, where the ranking of query results is done based on term- frequency values.
  • serviceSpecificInfo Some examples are serviceReputation and contactlnformation.
  • serviceReputation specifies the reputation of the service. This information can be presented to the user at the end of the search process to help the user choose among the different search results. This reputation score can also be used to rank order the search results.
  • serviceReputation is an optional field within publishWithKeyword. In contrast to serviceReputation, contactlnformation field is mandatory within publishWithKeyword and must be published along with every keyword extracted from the required and optional fields.
  • overlayURI An URI pointer to the service description document in the overlay
  • weburi An URL or URI that is a pointer to the service or the service description (this may not be an overlay specific pointer)
  • contactNode Information about the node that offers the service, such as the node identifier or nodeID (the contactNode field may contain additional information such as reputation rating of the node and location of the node to facilitate scoping and ranking of results); or contactPerson: Name and contact information of the person responsible for the service.
  • publishWithKeyword may be used for rank-ordering and scoping the retrieved results and is published along with the keywords in the DocumentPointer and Otherlnfo fields of the keyword PUT command.
  • OWL-S provides upper layer ontology for services.
  • the service is described using the service class.
  • the class Service provides an organizational point of reference for a declared Web service.
  • Each instance of Service will present a ServiceProfile description, be describedBy a ServiceModel description, and support a ServiceGrounding description.
  • the ServiceProfile provides the information needed for an agent to discover a service, while the ServiceModel and ServiceGrounding, taken together, provide enough information for an agent to make use of a service, once found.
  • the service profile tells "what the service does" in a way that is suitable for a service-seeking agent to determine whether the service meets its needs.
  • This form of representation may include a description of what is accomplished by the service, limitations on service applicability and quality of service, and requirements that the service requester must satisfy to use the service successfully.
  • the ServiceProfile class in OWL-S provides all the information required for discovering the service and, therefore, this information is sufficient for publication.
  • the GSS 700 described above, encapsulates and provides a wrapper for the ServiceProfile class in OWL-S. Since the GSS 700 is based on the ServiceProfile, mapping OWL-S properties to GSS fields is straightforward as illustrated in Table 3.
  • WSDL describes a Web service in two fundamental stages: one abstract and one concrete. Within each stage, the description uses a number of constructs to promote reusability of the description and to separate independent design concerns. There are two popular versions of WSDL, namely, WSDL 1.1 and WSDL 2.0. At an abstract level, WSDL describes a Web service in terms of the messages it sends and receives; messages are described independent of a specific wire format using a type system, typically XML Schema. An operation associates a message exchange pattern with one or more messages. A message exchange pattern identifies the sequence and cardinality of messages sent and/or received as well as who they are logically sent to and/or received from.
  • An interface groups together operations without any commitment to transport or wire format.
  • a binding specifies transport and wire format details for one or more interfaces.
  • An endpoint associates a network address with a binding.
  • a service groups together endpoints that implement a common interface.
  • GSS 700 provides a mechanism to convert the WSDL 2.0 service descriptions to GSS 700 and leaves the conversion of WSDL 1.1 to WSDL 2.0 to such convertors.
  • WSDL does not have a ServiceProfile and the information required for discovering the service needs to be gleaned from the entire service description.
  • Table 4 details are provided to show the GSS fields and part of the WSDL 2.0 service description from which they can be extracted.
  • GSS 700 some fields in GSS 700, such as servicename and textdescription, can be obtained from the properties of the WSDL service and some other GSS fields, such as haslnput and hasOutput, can be derived from the properties of the WSDL interface component.
  • the Universal Description, Discovery, and Integration (UDDI) protocol is a central element of the group of related standards that comprise the Web services stack.
  • the UDDI specification defines a standard method for publishing and discovering the network-based software components of a service-oriented architecture. Its development is led by the OASIS consortium of enterprise software vendors and customers.
  • a UDDI registry's functional purpose is the representation of data and metadata about Web services.
  • a registry either for use on a public network or within an organization's internal infrastructure, offers a standards-based mechanism to classify, catalog, and manage Web services, so that they can be discovered and consumed by other applications.
  • UDDI offers several benefits to IT managers at both design-time and run-time, including increasing code re-use and improving infrastructure management.
  • the core information model used by a UDDI registry is defined in several XML schemas. XML was chosen because it offers a platform-neutral view of data and allows hierarchical relationships to be described in a natural way. XSD was chosen because of its support for rich data types and its ability to easily describe and validate information based on information models represented in schemas. The UDDI XSD's form a base information model and interaction framework of UDDI registries.
  • the main components of the information model include: A description of a service's business function (called the businessService); Information about the organization that published the service (businessEntity); The service's technical details (bindingTemplate), including a reference to the service's programmatic interface or API; and Various other attributes or metadata such as taxonomy, transports, digital signatures, etc defined in tModels.
  • businessService A description of a service's business function
  • businessEntity Information about the organization that published the service
  • bindingTemplate including a reference to the service's programmatic interface or API
  • Various other attributes or metadata such as taxonomy, transports, digital signatures, etc defined in tModels.
  • Table 5 provided are details to show the GSS fields and part of the UDDI service description from which they can be extracted.
  • UPnP derived from phrase "Universal Plug and Play” is a set of networking protocols that aim to provide simple peer-to-peer networking for devices in home and corporate environments. It achieves this goal by defining protocols base on open, Internet-based standards, such as TCP/IP, HTTP, XML and SOAP. UPnP protocols define almost all aspects of peer-to-peer networking, including procedures for addressing, service discovery, service description, and control for service exchange, event notification and presentation.
  • UPnP defines two classes of functional entities: Device, which offer services, and Control point, through which a user may control services offered by a device.
  • UPnP's service discovery protocol known as Simple Service Discovery Protocol (SSDP)
  • SSDP Simple Service Discovery Protocol
  • SSDP Simple Service Discovery Protocol
  • a control point uses SSDP to search for devices of interest in the network.
  • After a control point discovers a service it retrieves a comprehensive description of the service (expressed in XML) from the URL it has obtained during service discovery.
  • This service description file contains a list of embedded services, as well as URLs for information on control, event notification and presentation.
  • the devices multicast (or unicast) a NOTIFY message when they are added to the network or when they renew their advertisements.
  • the NOTIFY message uses:
  • NOTIFY indicates this message is a service advertisement
  • HOST provides IP address and port number of the advertised service; devices typically use 239.255.255.250:1900 for NOTIFY messages,
  • CACHE-CONTROL sets the life time of the advertised service in seconds
  • LOCATION specifies the URL to the UPnP description for the root device
  • NT specifies the search target of the advertised service
  • NTS indicates the current status of SSDP
  • UPnP does not define any name for a service as part of the NOTIFY message.
  • the NOTIFY message contains the URL for UPnP description in the LOCATION field and this document contains additional information about the service including the name of the service offered by the device.
  • the NOTIFY message contains the URL for the UPnP description.
  • a node publishes a service, it also needs to extract the information from the UPnP description from the LOCATION field of the NOTIFY message and publish it on the overlay.
  • This information is specified in XML.
  • the description is in two parts: one for the device and one per nested service offered by the device.
  • the device description contains the type of device, container properties, and user interface (UI) information specified by the device.
  • the device description is in the XML format. Services are functional units in a device and are contained in a container.
  • the service description file contains the methods and state variables (or properties) and is similar to what would be contained in an OWL-S or WSDL file.
  • a sample XML file used for describing services is given in Appendix I.
  • the device needs to publish two sets of information. The first one is derived from the NOTIFY message and contains information about the location of the service description and NT/ST values that are required for answering UPnP M- SEARCH queries. The second set of information to be published comes from the device/service description file.
  • the publishing node shall create GSS 800 depicted in Fig. 8.
  • the NOTIFY messages are used to advertise, update, and delete a device in the overlay. The next step is to publish the device/ service description file.
  • Appendix I provides an example of a UPnP device description file written in XML and the corresponding GSS is shown in Appendix J.
  • the device description file contains information about the device, the model, model name, manufacturer, and model URI.
  • the device description file contains information about the services offered by the device enclosed in ⁇ service> ⁇ /service> field. This field contains further information about the service including the URI for the service description file.
  • the service offering peer also needs to extract this information and publish it on the overlay in the form of a GSS.
  • GSS 700 takes a simplistic approach to handle this problem.
  • GSS 700 defines a list of standard attribute names for commonly used ones such as servicename, textdescription, haslnput, hasOutput, etc. as described above.
  • GSS 700 extracts the corresponding values from the native service description schema and publish them in the overlay along with the standard attribute names.
  • GSS 700 directly publishes the attribute names as defined in the native schema.
  • the plug-ins 206 (Fig. 2) defined above help in this process of publication and translate the native attribute names to the standard attribute names.
  • one example of a normalized overlay schema 209 includes the GSS 700 described above, however, it should be understood that other specific schemas may be developed that embody the above-described functionality of the normalized overlay schema 209.
  • a component may be, but is not limited to being, a process running on a processor, a processor, an object, an executable, a thread of execution, a program, and/or a computer.
  • an application running on a computing device and the computing device can be a component.
  • One or more components can reside within a process and/or thread of execution and a component may be localized on one computer and/or distributed between two or more computers.
  • these components can execute from various computer readable media having various data structures stored thereon.
  • the components may communicate by way of local and/or remote processes such as in accordance with a signal having one or more data packets, such as data from one component interacting with another component in a local system, distributed system, and/or across a network such as the Internet with other systems by way of the signal.
  • a terminal can be a wired terminal or a wireless terminal.
  • a terminal can also be called a system, device, subscriber unit, subscriber station, mobile station, mobile, mobile device, remote station, remote terminal, access terminal, user terminal, terminal, communication device, user agent, user device, or user equipment (UE).
  • a wireless terminal may be a cellular telephone, a satellite phone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device having wireless connection capability, a computing device, or other processing devices connected to a wireless modem.
  • SIP Session Initiation Protocol
  • WLL wireless local loop
  • PDA personal digital assistant
  • a base station may be utilized for communicating with wireless terminal(s) and may also be referred to as an access point, a Node B, or some other terminology.
  • the term "or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless specified otherwise, or clear from the context, the phrase “X employs A or B” is intended to mean any of the natural inclusive permutations. That is, the phrase “X employs A or B” is satisfied by any of the following instances: X employs A; X employs B; or X employs both A and B.
  • the articles “a” and “an” as used in this application and the appended claims should generally be construed to mean “one or more” unless specified otherwise or clear from the context to be directed to a singular form.
  • a CDMA system may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, etc.
  • UTRA includes Wideband-CDMA (W-CDMA) and other variants of CDMA.
  • W-CDMA Wideband-CDMA
  • cdma2000 covers IS-2000, IS-95 and IS-856 standards.
  • GSM Global System for Mobile Communications
  • An OFDMA system may implement a radio technology such as Evolved UTRA (E-UTRA), Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc.
  • E-UTRA Evolved UTRA
  • UMB Ultra Mobile Broadband
  • IEEE 802.11 Wi-Fi
  • WiMAX IEEE 802.16
  • Flash-OFDM Flash-OFDM
  • UTRA and E-UTRA are part of Universal Mobile Telecommunication System (UMTS).
  • UMTS Universal Mobile Telecommunication System
  • 3GPP Long Term Evolution (LTE) is a release of UMTS that uses E-UTRA, which employs OFDMA on the downlink and SC-FDMA on the uplink.
  • UTRA, E-UTRA, UMTS, LTE and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP).
  • wireless communication systems may additionally include peer- to-peer (e.g., mobile-to-mobile) ad hoc network systems often using unpaired unlicensed spectrums, 802. xx wireless LAN, BLUETOOTH and any other short- or long- range, wireless communication techniques.
  • peer- to-peer e.g., mobile-to-mobile
  • 802. xx wireless LAN e.g., 802. xx wireless LAN, BLUETOOTH and any other short- or long- range, wireless communication techniques.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • a general-purpose processor may be a microprocessor, but, in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine.
  • a processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration. Additionally, at least one processor may comprise one or more modules operable to perform one or more of the steps and/or actions described above.
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • An exemplary storage medium may be coupled to the processor, such that the processor can read information from, and write information to, the storage medium.
  • the storage medium may be integral to the processor.
  • the processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a user terminal.
  • processor and the storage medium may reside as discrete components in a user terminal. Additionally, in some aspects, the steps and/or actions of a method or algorithm may reside as one or any combination or set of codes and/or instructions on a machine readable medium and/or computer readable medium, which may be incorporated into a computer program product.
  • the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored or transmitted as one or more instructions or code on a computer-readable medium.
  • Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another.
  • a storage medium may be any available media that can be accessed by a computer.
  • such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • any connection may be termed a computer-readable medium.
  • a computer-readable medium includes compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and blu-ray disc where disks usually reproduce data magnetically, while discs usually reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.
  • BraviAur is defined as a AirlineTicketing service. It inherits from the ontology of services that is an eCommerce service, and that the product it sells products that are restricted to be CommercialAirlineT ravel.
  • the same service could be specified outside the hierarchy of services by declaring it an instance of Profile, and by adjusting the relevant properties accordingly.
  • This service provide flight reservations based on the specification of a flight request. This typically involves a departure airport, an arrival airport, a departure date, and if a return trip is required, a return date. If the desired flight is available, an itinerary and reservation number will be returned.
  • the two conctacs are related to the profile through different instances of the contactlnfo relation — >
  • This service provide flight reservations based on the specification of a flight request. This typically involves a departure airport, an arrival airport, a departure date, and if a return trip is required, a return date. If the desired flight is available, an itinerary and reservation number will be returned.
  • overlayURI pointer MUST be published along with all keywords ->
  • the publishing node needs to download the XML device/ service description file from the LOCATION field and publish it separately on the overlay.
  • the peer responsible for the service needs to maintain a table with a list of services that it offers along with a location of the device/ service description file. Once the delete command is issued using the NOTIFY message (as above), the responsible peer needs to obtain the device/ service description file and send delete commands for each keyword in the file. Alternatively, the storing nodes may delete the keywords when the lifetime expires.

Abstract

L'invention porte sur des procédés et un appareil pour publier des services et réaliser des interrogations pour un service dans un réseau. Des descriptions de service écrites dans un langage de description de recherche natif sont traduites en un schéma normalisé. Le schéma normal est publié sur le réseau. Des interrogations à l'intention du réseau, qui peuvent être écrites dans tout langage de description de recherche natif, sont également traduites en un schéma normalisé avant d'effectuer la recherche. En conséquence, tous les services disponibles peuvent être publiés et localisés dans une interrogation sans considération du langage de description de recherche natif.
PCT/US2010/038440 2009-06-11 2010-06-11 Procédés et appareil pour un modèle de plugiciel pour publier une découverte à base de métadonnées structurées WO2010144889A1 (fr)

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CN201080025464.8A CN102461125B (zh) 2009-06-11 2010-06-11 用于发布基于结构化元数据的发现的插件模型的方法和装置
JP2012515206A JP2012530299A (ja) 2009-06-11 2010-06-11 構造化メタデータに基づく発見を公開するプラグインモデルのための方法および装置
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